For pozole there's La Casa de Toño (various locations), also good quesadillas. Or Pozolería Teoixtla in Roma.

As came up on another thread recently there's a lot of street food around Metro Chilpancingo, and on Avenida Chilpancingo you'll find a place that does good roasted chicken, Rosticería San Juan, among many other options.

Barbacoa at your local street market whatever day they come, La Oveja Negra in Sta. Maria de la Ribera, or the Texcoco market

Pollos Rio makes a great roast chicken... The best ones are often chains from Sinaloa.

Where are you wanting street tacos and what kind... Meat ones or guisados? Apart from Tacos Hola, there are tacos de guisado Don Juan on the corner of Juan Escutia and Atlixco (I think, could be a block off). Mostly, look for a million people eating so e place and its likely good.